Mechanical Engineering Questions And Answers :: Engineering Materials: part4

Mechanical Engineering : Engineering Materials QUESTIONS AND ANSWERS :: part4 : 1 to 5

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2021 and IES 2021 examinations :

1.Which is false statement about normalising. Normalising is done to

refine grain structure
reduce segregation in casting
improve mechanical properties
induce stresses-
relieve internal stresses.

2.Argentite is the principal ore or raw material for


3.Chromium in steel

improves wear resistance, cutting ability and toughness
refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
improves cutting ability and reduces hardenability
gives ductility, toughness, tensile strength and anticorrosion properties
makes steel hard.

4.Which is false statement about tempering. Tempering is done to

improve machinability
improve ductility
improve toughness
release stresses
reduce hardness and brittleness.

5.Hardness of upper bainite (acicular structure) is about

RC 65
RC 48
RC 57
RC 80
RC 32.

More Engineering Materials QUESTIONS AND ANSWERS available in next pages

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